Band-pass filtering circuit, control method thereof and MEMS gyroscope drive circuit

A band-pass filtering and circuit technology, applied in the field of signal processing, can solve the problems that cannot meet the requirements of portable products, large circuit area, high power consumption and cost

Inactive Publication Date: 2015-04-22
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing bandpass filters use two or more op amps, resulting in large circuit are

Method used

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  • Band-pass filtering circuit, control method thereof and MEMS gyroscope drive circuit
  • Band-pass filtering circuit, control method thereof and MEMS gyroscope drive circuit
  • Band-pass filtering circuit, control method thereof and MEMS gyroscope drive circuit

Examples

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Embodiment Construction

[0053] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.

[0054] figure 1 It is a schematic diagram of the system principle of the MEMS gyroscope and its driving circuit. The MEMS gyroscope driving circuit 100 includes a driving signal generating circuit 101 and a feedback signal processing circuit 102 . The driving signal generation circuit 101 provides a driving signal, such as a constant-amplitude sinusoidal signal, to the driving comb electrode 201 of the MEMS gyroscope 200 . The feedback signal processing circuit 102 acquires and processes the drive detection signal from the drive detection comb electrode 202 of the MEMS gyroscope, and performs feedback control on the drive signal generation circuit 101 .

[0055] The...

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PUM

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Abstract

The invention discloses a band-pass filtering circuit and a control method of the band-pass filtering circuit. The band-pass filtering circuit receives input signals and provides effective in-band output signals with out-of-band noise being filtered out. The band-pass filtering circuit sequentially executes the following steps in each sampling cycle that the input signals are sampled at the input end of an operational amplifier and stored in a capacitor at the input end in an electric charge mode, sampling causes changes of the quantity of electric charge of the capacitor at the input end, and the part of electric charge, changed due to sampling, of the capacitor at the input end is transmitted to an output capacitor from the input end of the operational amplifier; part of capacitance is reset to a common mode voltage, and the remaining capacitance maintains the quantity of electric charge in the last state. A switched capacitor circuit technology is adopted by the band-pass filtering circuit, the structure is simple, only one operational amplifier is needed, the area is small, the complexity is lowered, in this way, the power consumption of a whole chip is lowered, and the area of the chip is reduced.

Description

technical field [0001] The invention belongs to signal processing technology, and in particular relates to a band-pass filter circuit, a control method thereof, and a MEMS gyroscope driving circuit. Background technique [0002] The application fields of Microelectromechanical Systems (MEMS for short) are becoming more and more extensive. In these applications, MEMS gyroscopes are an important angular velocity sensor. [0003] A MEMS gyroscope generally includes a mass block, and driving comb-teeth electrodes and drive-detection comb-teeth electrodes respectively arranged on the mass block along first and second directions perpendicular to each other. The comb-teeth electrodes are driven to apply an electrostatic force to the mass block along the first direction, so that the mass block resonates along the first direction. When there is an angular velocity in the motion of the system, the mass block will vibrate along the second direction due to the force in the second dire...

Claims

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Application Information

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IPC IPC(8): H03H11/12G01C19/5776
Inventor 潘华兵胡铁刚郑泉智陈灿锋
Owner HANGZHOU SILAN MICROELECTRONICS
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